JQuery - Tutorialspoint

[Pages:44]jQuery i

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About the Tutorial

jQuery is a fast and concise JavaScript library created by John Resig in 2006. jQuery simplifies HTML document traversing, event handling, animating, and Ajax interactions for Rapid Web Development.

Audience

This tutorial is designed for software programmers who wants to learn the basics of jQuery and its programming concepts in simple and easy ways. This tutorial will give you enough understanding on components of jQuery with suitable examples.

Prerequisites

Before proceeding with this tutorial, you should have a basic understanding of HTML, CSS, JavaScript, Document Object Model (DOM) and any text editor. As we are going to develop web based application using jQuery, it will be good if you have understanding on how internet and web based applications work

Copyright & Disclaimer

? Copyright 2015 by Tutorials Point (I) Pvt. Ltd. All the content and graphics published in this e-book are the property of Tutorials Point (I) Pvt. Ltd. The user of this e-book is prohibited to reuse, retain, copy, distribute or republish any contents or a part of contents of this e-book in any manner without written consent of the publisher. We strive to update the contents of our website and tutorials as timely and as precisely as possible, however, the contents may contain inaccuracies or errors. Tutorials Point (I) Pvt. Ltd. provides no guarantee regarding the accuracy, timeliness or completeness of our website or its contents including this tutorial. If you discover any errors on our website or in this tutorial, please notify us at contact@

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Table of Contents

About the Tutorial....................................................................................................................................i Audience ..................................................................................................................................................i Prerequisites ............................................................................................................................................i Copyright & Disclaimer.............................................................................................................................i Table of Contents ....................................................................................................................................ii

1. OVERVIEW...........................................................................................................................1

What is jQuery? ......................................................................................................................................1 How to use jQuery?.................................................................................................................................1 Local Installation .....................................................................................................................................2 CDN Based Version..................................................................................................................................2 How to Call a jQuery Library Functions?..................................................................................................3 How to Use Custom Scripts?....................................................................................................................4 Using Multiple Libraries ..........................................................................................................................5 What is Next ?.........................................................................................................................................6

2. BASICS .................................................................................................................................7

String ......................................................................................................................................................7 Numbers .................................................................................................................................................7 Boolean ................................................................................................................................................... 7 Objects ....................................................................................................................................................8 Arrays...................................................................................................................................................... 8 Functions ................................................................................................................................................8 Arguments ..............................................................................................................................................9 Context ...................................................................................................................................................9 Scope ....................................................................................................................................................10 Callback ................................................................................................................................................. 10

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Closures ................................................................................................................................................11 Proxy Pattern ........................................................................................................................................12 Built-in Functions ..................................................................................................................................12 The Document Object Model ................................................................................................................13

3. SELECTORS ........................................................................................................................ 15

The $() Factory Function........................................................................................................................15 How to Use Selectors?...........................................................................................................................17 jQuery - Element Name Selector ...........................................................................................................17 jQuery - Element ID Selector .................................................................................................................19 jQuery - Element Class Selector.............................................................................................................20 jQuery - Universal Selector....................................................................................................................22 jQuery - Multiple Elements Selector......................................................................................................24 Selectors Examples................................................................................................................................26

4. JQUERY ATTRIBUTES..........................................................................................................31

Get Attribute Value ...............................................................................................................................31 Set Attribute Value................................................................................................................................32 Applying Styles......................................................................................................................................33 Attribute Methods ................................................................................................................................34 attr( properties ) Method ......................................................................................................................35 attr( key, func ) Method ........................................................................................................................37 removeAttr( name ) Method .................................................................................................................39 hasClass( class ) Method .......................................................................................................................40 removeClass( class ) Method.................................................................................................................42 toggleClass( class ) Method ...................................................................................................................43 html( ) Method......................................................................................................................................44 html( val ) Method ................................................................................................................................46 text( ) Method.......................................................................................................................................47

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text( val ) Method .................................................................................................................................48 val( ) Method ........................................................................................................................................50 val( val ) Method ...................................................................................................................................51

5. DOM TRAVERSING.............................................................................................................55

Find Elements by Index .........................................................................................................................55 Filtering Out Elements...........................................................................................................................57 Locating Descendent Elements..............................................................................................................58 JQuery DOM Filter Methods..................................................................................................................59 eq( index ) Method................................................................................................................................60 filter( selector ) Method ........................................................................................................................61 filter( fn ) Method .................................................................................................................................63 is( selector ) Method .............................................................................................................................64 map( callback ) Method.........................................................................................................................66 not( selector ) Method ..........................................................................................................................68 slice( start, end ) Method ......................................................................................................................70 JQuery DOM Traversing Methods .........................................................................................................71 add( selector ) Method..........................................................................................................................73 andSelf( ) Method .................................................................................................................................75 children( [selector] ) Method ................................................................................................................76 closest( selector ) Method.....................................................................................................................77 contents( ) Method ...............................................................................................................................79 end( ) Method .......................................................................................................................................80 find( selector ) Method .........................................................................................................................81 next( [selector] ) Method ......................................................................................................................83 nextAll( [selector] ) Method ..................................................................................................................84 offsetParent() Method ..........................................................................................................................85 parent( [selector] ) Method...................................................................................................................86

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parents( [selector] ) Method .................................................................................................................88 prev( [selector] ) Method ......................................................................................................................89 prevAll( [selector] ) Method ..................................................................................................................91 siblings( [selector] ) Method .................................................................................................................92

6. CSS SELECTOR METHODS ..................................................................................................94

Apply CSS Properties .............................................................................................................................94 Apply Multiple CSS Properties...............................................................................................................94 Setting Element Width & Height ...........................................................................................................96 JQuery CSS Methods .............................................................................................................................97 css( name ) Method...............................................................................................................................98 css( name, value ) Method ..................................................................................................................100 css( properties ) Method .....................................................................................................................101 height( val ) Method............................................................................................................................103 height( ) Method .................................................................................................................................105 innerHeight( ) Method ........................................................................................................................106 innerWidth( ) Method .........................................................................................................................108 offset( ) Method..................................................................................................................................110 offsetParent( ) Method .......................................................................................................................112 outerHeight( [margin] ) Method..........................................................................................................114 outerWidth( [margin] ) Method ..........................................................................................................116 position( ) Method ..............................................................................................................................118 scrollLeft( val ) Method .......................................................................................................................120 scrollLeft( ) Method.............................................................................................................................121 scrollTop( val ) Method .......................................................................................................................123 scrollTop( ) Method.............................................................................................................................125 width( val ) Method ............................................................................................................................128 width( ) Method..................................................................................................................................129

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7. DOM MANIPULATION......................................................................................................132

Content Manipulation .........................................................................................................................132 DOM Element Replacement ................................................................................................................133 Removing DOM Elements ...................................................................................................................135 Inserting DOM Elements .....................................................................................................................136 DOM Manipulation Methods ..............................................................................................................138 after( content ) Method ......................................................................................................................140 append( content ) Method ..................................................................................................................141 appendTo( selector ) Method..............................................................................................................143 before( content ) Method ...................................................................................................................144 clone( bool ) Method...........................................................................................................................146 clone( ) Method...................................................................................................................................148 empty( ) Method.................................................................................................................................149 html( val ) Method ..............................................................................................................................151 html( ) Method....................................................................................................................................152 insertAfter( selector ) Method ............................................................................................................155 insertBefore( selector ) Method ..........................................................................................................157 prepend( content ) Method.................................................................................................................159 prependTo( selector ) Method ............................................................................................................160 remove( expr ) Method .......................................................................................................................162 replaceAll( selector ) Method ..............................................................................................................164 replaceWith( content ) Method...........................................................................................................165 text( val ) Method ...............................................................................................................................167 text( ) Method.....................................................................................................................................169 wrap( elem ) Method ..........................................................................................................................172 wrap( html ) Method...........................................................................................................................174 wrapAll( elem ) Method ......................................................................................................................175

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wrapAll( html ) Method.......................................................................................................................177 wrapInner( elem ) Method ..................................................................................................................179 wrapInner( html ) Method ..................................................................................................................181

8. EVENTS HANDLING..........................................................................................................184

Binding Event Handlers .......................................................................................................................184 Removing Event Handlers ...................................................................................................................186 Event Types.........................................................................................................................................186 The Event Object .................................................................................................................................188 The Event Attributes ...........................................................................................................................188 The Event Methods .............................................................................................................................191 preventDefault() Method ....................................................................................................................192 isDefaultPrevented() Method..............................................................................................................193 stopPropagation() Method..................................................................................................................195 isPropagationStopped() Method .........................................................................................................196 stopImmediatePropagation() Method.................................................................................................198 isImmediatePropagationStopped() Method........................................................................................200 Event Manipulation Methods..............................................................................................................202 bind( type, [data], fn ) Method............................................................................................................203 off( events [, selector ] [, handler(eventObject) ] ) Method .................................................................205 hover( over, out ) Method...................................................................................................................207 on( events [, selector ] [, data ], handler ) Method ..............................................................................208 one( type, [data], fn ) Method.............................................................................................................210 ready( fn ) Method ..............................................................................................................................212 trigger( event, [data] ) Method ...........................................................................................................213 triggerHandler( event, [data] ) Method...............................................................................................215 unbind( [type], [fn] ) Method ..............................................................................................................216 Event Helper Methods ........................................................................................................................218

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